Modulation tutorial.ppt
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The document discusses different digital modulation techniques used in radio signals, including BPSK, QPSK, and 8PSK. It explains that these PSK modulation schemes encode bits as phases in radio signals. BPSK encodes 1 bit per symbol, allowing a maximum data rate equal to the number of symbols per second. QPSK encodes 2 bits per symbol, doubling the maximum data rate. 8PSK encodes 3 bits per symbol. The document uses examples to show how these modulation schemes can be used to transmit different data rates, depending on the number of bits encoded in each symbol and the symbol rate defined by the available channel bandwidth.
Modulation tutorial.ppt
- 1. Background
- 6. PSK HL Type Summary
- 10. BPSK Type 1 bits on
- 11. QPSK Type 2 bits on
- 12. 8PSK Type 3 bits on
- 13. TYPES ALL PSK
- 14. Flagman At Ease
- 15. 1 Bit Per Second 0 1 Bit Per Second Radio Signal
- 16. 1 Bit Per Second 1 1 Bit Per Second Radio Signal
- 17. 2 Bit Per Second 00 2 Bits Per Second Radio Signal
- 18. 2 Bit Per Second 10 Radio Signal 2 Bits Per Second
- 19. 2 Bit Per Second 01 Radio Signal 2 Bits Per Second
- 20. 2 Bit Per Second 11 Radio Signal 2 Bits Per Second
- 21. Data Rate Data Rate = Bits per Second
- 22. Bitream 0 1000 Bits Per Second 1000 Symbols (Phases) Per Second 1000 Symbols Per Second x 1 Bit Per Symbol = 1000 Bits Per Second BPSK
- 23. Bitream 1 1000 Bits Per Second 1000 Symbols (Phases) Per Second BPSK 1000 Symbols Per Second x 1 Bit Per Symbol = 1000 Bits Per Second
- 24. Bitream 00 2000 Bits Per Second 1000 Symbols (Phases) Per Second QPSK 1000 Symbols Per Second x 2 Bits Per Symbol = 2000 Bits Per Second
- 25. Bitream 10 2000 Bits Per Second 1000 Symbols (Phases) Per Second QPSK 1000 Symbols Per Second x 2 Bits Per Symbol = 2000 Bits Per Second
- 26. Bitream 01 2000 Bits Per Second 1000 Symbols (Phases) Per Second QPSK 1000 Symbols Per Second x 2 Bits Per Symbol = 2000 Bits Per Second
- 27. Bitream 11 2000 Bits Per Second 1000 Symbols (Phases) Per Second QPSK 1000 Symbols Per Second x 2 Bits Per Symbol = 2000 Bits Per Second
- 28. Bitstream 000 3000 Bits Per Second 1000 Symbols (Phases) Per Second 8PSK 1000 Symbols Per Second x 3 Bits Per Symbol = 3000 Bits Per Second
- 29. Bitstream 001 3000 Bits Per Second 1000 Symbols (Phases) Per Second 8PSK 1000 Symbols Per Second x 3 Bits Per Symbol = 3000 Bits Per Second
- 30. Bitstream 010 3000 Bits Per Second 1000 Symbols (Phases) Per Second 8PSK 1000 Symbols Per Second x 3 Bits Per Symbol = 3000 Bits Per Second
- 31. Bitstream 011 3000 Bits Per Second 1000 Symbols (Phases) Per Second 8PSK 1000 Symbols Per Second x 3 Bits Per Symbol = 3000 Bits Per Second
- 32. Bitstream 100 3000 Bits Per Second 1000 Symbols (Phases) Per Second 8PSK 1000 Symbols Per Second x 3 Bits Per Symbol = 3000 Bits Per Second
- 33. Bitstream 101 3000 Bits Per Second 1000 Symbols (Phases) Per Second 8PSK 1000 Symbols Per Second x 3 Bits Per Symbol = 3000 Bits Per Second
- 34. Bitstream 110 3000 Bits Per Second 1000 Symbols (Phases) Per Second 8PSK 1000 Symbols Per Second x 3 Bits Per Symbol = 3000 Bits Per Second
- 35. Bitstream 111 3000 Bits Per Second 1000 Symbols (Phases) Per Second 8PSK 1000 Symbols Per Second x 3 Bits Per Symbol = 3000 Bits Per Second
- 36. TYPES ALL PSK
- 37. Circle Vocoder
- 39. Blocks Stretched 8000 Bits Per Second
- 40. Additional Bits Additional Bits • Channel • Ground Station • Power • Identity • Billing 1. Error Correction 2. Control Information
- 41. Modulator
- 42. 0 Bit in/Wave out
- 43. 1 Bit in/Wave out
- 44. Colored Balls 1
- 45. Colored Balls 2
- 46. 6000 Hz Available 6000 Hz Available Bandwidth Nyquist’s Theorem: Can transmit 4000 symbols per second through a 6000 Hz channel
- 47. Colored Balls 2 Nyquist’s Theorem: Can transmit 4000 symbols per second through a 6000 Hz channel
- 48. BPSK 4000 < 8000 • BPSK: 1 Bit Per Symbol • 4000 Bits Per Second (bps) • 4000 bps < 8000 bps (Vocoder rate) • BPSK
- 49. QPSK 8000 BPS • QPSK: 2 Bits Per Symbol • 2 X 4000 = 8000 Bits Per Second (bps) • 8000 bps = Vocoder rate • Need more bits for error correction and control! • QPSK
- 50. 8PSK 12000 BPS • 8PSK: 3 Bits Per Symbol • 3 X 4000 = 12,000 Bits Per Second (bps) • 8000 bps + 4000 bps Vocoder rate + Error Correction and Control • 8PSK
- 51. 16 PSK 16000 BPS • 16 phases: 4 Bits Per Symbol • 4 x 4000 = 16,000 bps • More than enough for vocoder rate + overhead
- 52. MOTION BLUR
- 53. Meters
- 55. TYPES ALL PSK
- 56. 8 PSK FOCUS